From fceb1a37df623649d191c3c1a881e5b0538b1391 Mon Sep 17 00:00:00 2001
From: mitchell <70453897+667e-11@users.noreply.github.com>
Date: Tue, 3 Mar 2020 19:39:02 -0500
Subject: Added test suite and API type checking for more helpful error
 messages.

---
 modules/textadept/file_types.lua | 1 +
 1 file changed, 1 insertion(+)

(limited to 'modules/textadept/file_types.lua')

diff --git a/modules/textadept/file_types.lua b/modules/textadept/file_types.lua
index df35f861..f0ce5bdb 100644
--- a/modules/textadept/file_types.lua
+++ b/modules/textadept/file_types.lua
@@ -65,6 +65,7 @@ local SETLEXERLANGUAGE = _SCINTILLA.properties.lexer_language[2]
 local GETERROR = _SCINTILLA.properties.status[1]
 -- LuaDoc is in core/.buffer.luadoc.
 local function set_lexer(buffer, lang)
+  assert_type(lang, 'string/nil', 2)
   if not lang then lang = detect_language(buffer) end
   buffer:private_lexer_call(SETDIRECTPOINTER, buffer.direct_pointer)
   buffer:private_lexer_call(SETLEXERLANGUAGE, lang)
-- 
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